fn main() {
    let tup = (500, 6.4, 1);
    let (_x, y, _z) = tup;
    println!("y:{}", y); //y:6.4

    let f = tup.0;
    let s = tup.1;
    let one = tup.2;

    println!("f:{},s:{},one:{}", f, s, one); //f:500,s:6.4,one:1
}
